Charbrew, which makes the teabags, investigated Miss Nelson’s claim and said it did not believe the contamination came from them.

However, Miss Nelson, argues: ‘I tweeted them a picture of the teabag and they emailed me back saying they have safety procedures in place and implied the infestation came from my end, but I don’t know how the bugs would have got inside a sealed box…the eggs must have already been there.’

‘[Charbrew] They want to send me a goodwill gesture, but I don’t want any more tea…I’m strictly on the coffee now!’, she went on to add.

The firm said in a statement: ‘All of our teas are produced in an ISO 22,000 (food safety certified) factory with an in-house CO2 chamber to completely sterilize all herbal products, so that they do not become a growth medium of micro-organisms or insects before processing.’